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740 injectors whats the maximum they can flow

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Old 12 August 2009, 05:40 PM
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Mus
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Default 740 injectors whats the maximum they can flow

ive got the above and fuel pressure reg whats the maximum bhp you can run with these before i have to sell them and buy bigger ones. ive currently got a built 2.5 with a 20G getting used to it now. and now im looking 480/480 or even a touch more than that. are these injectors sufficient enough and would i need to change my fuel pump to a bosch one?

many thanks in advance

mus
Old 12 August 2009, 06:07 PM
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smokingkills
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Originally Posted by mus 1st class sti type r
ive got the above and fuel pressure reg whats the maximum bhp you can run with these before i have to sell them and buy bigger ones. ive currently got a built 2.5 with a 20G getting used to it now. and now im looking 480/480 or even a touch more than that. are these injectors sufficient enough and would i need to change my fuel pump to a bosch one?

many thanks in advance

mus
Are you planning on reaching 480 with meth or e85? What turbo will you use? A mate of mine is using the new s206 on his 2.5 & that should reach your target on normal fuel, I believe he is using 820s which don't break a sweat.

Last edited by smokingkills; 12 August 2009 at 06:09 PM.
Old 12 August 2009, 10:29 PM
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Jam Performance
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Have been told I'll need a secondary 044 pump and swirl pot for 500 plus on my 2.1, I'm using lateral 960cc injectors
Old 12 August 2009, 10:54 PM
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Bob Rawle
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740's are fine for 500, I use them in my 2 litre, 504 bhp at 86% and 3.4 bar fuel pressure atmo. I do use a Bosch Motorsport version of the 044 mounted in tank. You shouldn't need a swirl pot for 480.

bob
Old 12 August 2009, 11:08 PM
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Mus
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if its just a fuel pump then thats great thanks again everyone.

smoking kills 470-480 with out meth and yes S206 is the turbo i will be going for might aswel try something a bit diffrent and see what happens im sure it will be ok ive spoken to a few people that are currently using it and they wouldnt swap it for anything else.
Old 12 August 2009, 11:09 PM
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Mus
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bob 500 on a 2 liter what turbo are you using?
Old 13 August 2009, 07:07 PM
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Originally Posted by mus 1st class sti type r
bob 500 on a 2 liter what turbo are you using?
Must be something big
Old 13 August 2009, 09:31 PM
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banny sti
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The 740cc injectors are rated to around 560bhp.

Banny
Old 13 August 2009, 09:53 PM
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joz8968
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Question

What are the 740's bhp rating (and at what % IDC) when run at OEM pressure i.e 3bar with vac hose off (or c.2.5 - 2.7bar when it's connected)?

Last edited by joz8968; 13 August 2009 at 09:57 PM.
Old 13 August 2009, 10:13 PM
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Mus
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thanks again everyone 560 thats a lot 2 much for my needs but nice to know
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